138 BULLETIN 18 0, UNITED STATES NATIONAL MUSEUM 



SIGANUS ROSTRATUS (Valenciennes) 



Amphacanthus rostratus Valenciennes, in Cuvier and Valenciennes, Histoire 

 uaturelle des poissons, vol. 10, p. 158, 1835. 



52502, Apia, Samoa, Jordan and Kellogg, 1 specimen. 

 SIGANUS PUNCTATUS (Bloch) 



Anvphacantlms punctatns Bloch, m Schneider, Systema ichthyologiae . . ., 

 p. 210, 1801. 



52494, Apia, Samoa, Jordan and Kellogg, 3 specimens. 



Family CHAETODONTIDAE 



KEY TO PHOENIX AND SAMOAN ISLAND SUBFAMILIES OF CHAETODONTIDAE 



la. Preoperculum serrated or not, but in adult no strong spine near lower angle ; 

 pelvics with an axillary scale Chaetodontinae 



16. Preoperculum strongly armed, with a long spine at lower angle ; pelvics with- 

 out an axillary scale Pomacanthinae 



Subfamily CHAETODONTINAE 



KEY TO THE SPECIES OF CHAETODONTINAE FOUND IN THE PHOENIX AND 



SAMOAN ISLANDS 



la. Snout produced into a long narrow tube by excessive prolongation of bones 

 in rostral part of head, length of snout about twice postorbital length of 

 head ; pactorals long, falcate, nearly 3 times postorbital part of head ; 

 minute teeth in jaws, dorsal rays XII or XIII, 22 to 23; anal about III, 18; 

 about 60 rows of scales on side of body ; pelvic fins pale in color ; pectorals 

 pale, dorsal edge blackish; caudal pale dusky; anal with posterior margin 

 light, then a submarginal narrow blackish line extends dorsally to join a 

 big black spot in posterior dorsal corner, soft dorsal with dusky posterior 

 margin, the very edge lighter, rest of fin pale ; body with a large triangular 

 brownish patch from origin of dorsal to base of pectoral, then forward 

 through pupil of eye to tip of long snout, most ir.tense in front of eye. 



Forcipiger longirostris (Broussonet) 

 1&. Snout not pi-oduced into a long narrow tul)e, but more or less conical, its 

 length about equal to the postorbital length of head ; pectoral not falcate ; 

 scale rows on side of body 55 or fewer ; teeth setiform or brushlike on jaws. 

 2a. Dorsal rays VI, 28 to 30; anal III, 19 to 20; scales 40 to 45; pelvics pale; 

 pectoral pale ; caudal pale ; anal with a black spot near its base poste- 

 riorly; soft dorsal with a black band along its base; a black spot in 

 dorsal-tinal transverse band on soft dorsal fin, latter with a submarginal 

 black band posteriorly ; base of spinous dorsal blackish, four transverse 

 black bands : one narrower than eye passes from nape through eye to 

 isthmus, where it meets its fellow on other side ; another begins in front 

 of dorsal, passes across pectoral base to pelvic fin base; third one passes 

 from second and third dorsal spines to front of anal fin ; fourth from 

 last dorsal spines to base of first soft rays of anal fin. Black ring around 

 caudal peduncle, top of snout blackish_ Parachaetodon ocellatus (Bloch) 

 2b. Dorsal rays XI to XIV. 



3a. Fourth dorsal spine prolonged, at least longer than any others, and in 

 some species filamentous; dorsal rays XI or XII, 22 to 27; anal III, 16 

 to 19 ; scales 44 to 58 ; pelvics jet black. 



